Reticular tissue membranes are thin membranes consisting of collagen and elastin that cover the surfaces of the capillary endothelium, hemolymphoid and connective tissue cells. In blood and tissues, they divide the general blood flow into capillary loops with a diameter of 15-22 microns, regulate gas exchange and stimulate the transport of substances, and establish a barrier between intact and damaged tissue. The separating integrity of the membrane passes to the phagocytic macrophage and histocyte. At